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                                <div id="anchor-navigation-ex-navbar"><i class="fa fa-navicon"></i><ul><ul><li><span class="title-icon "></span><a href="#math-&#x5E93;&#x7684;&#x4F7F;&#x7528;"><b></b>math &#x5E93;&#x7684;&#x4F7F;&#x7528;</a></li><ul><li><span class="title-icon "></span><a href="#&#x968F;&#x673A;&#x6570;"><b></b>&#x968F;&#x673A;&#x6570;</a></li></ul><li><span class="title-icon "></span><a href="#json-&#x7F16;&#x89E3;&#x7801;"><b></b>JSON &#x7F16;&#x89E3;&#x7801;</a></li><ul><li><span class="title-icon "></span><a href="#&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;"><b></b>&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;</a></li></ul><li><span class="title-icon "></span><a href="#dart-27-&#x65B0;&#x7279;&#x6027;"><b></b>Dart 2.7 &#x65B0;&#x7279;&#x6027;</a></li><ul><li><span class="title-icon "></span><a href="#&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;extension-methods&#xFF09;"><b></b>&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;Extension methods&#xFF09;</a></li><li><span class="title-icon "></span><a href="#&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;"><b></b>&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;</a></li></ul></ul></ul></div><a href="#" id="anchorNavigationExGoTop"><i class="fa fa-arrow-up"></i></a><!-- ex_nolevel -->
<h2 id="math-&#x5E93;&#x7684;&#x4F7F;&#x7528;"><a name="math-&#x5E93;&#x7684;&#x4F7F;&#x7528;" class="anchor-navigation-ex-anchor" href="#math-&#x5E93;&#x7684;&#x4F7F;&#x7528;"><i class="fa fa-link" aria-hidden="true"></i></a>math &#x5E93;&#x7684;&#x4F7F;&#x7528;</h2>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;dart:math&apos;</span>;

<span class="hljs-keyword">void</span> main() {
    <span class="hljs-comment">// &#x6700;&#x5927;&#x548C;&#x6700;&#x5C0F;&#x503C;</span>
    <span class="hljs-keyword">assert</span>(max(<span class="hljs-number">1</span>, <span class="hljs-number">1000</span>) == <span class="hljs-number">1000</span>);
    <span class="hljs-keyword">assert</span>(min(<span class="hljs-number">1</span>, <span class="hljs-number">-1000</span>) == <span class="hljs-number">-1000</span>);

    <span class="hljs-comment">// &#x6570;&#x5B66;&#x5E38;&#x91CF;</span>
    <span class="hljs-built_in">print</span>(e); <span class="hljs-comment">// 2.718281828459045</span>
    <span class="hljs-built_in">print</span>(pi); <span class="hljs-comment">// 3.141592653589793</span>
    <span class="hljs-built_in">print</span>(sqrt2); <span class="hljs-comment">// 1.4142135623730951</span>
}
</code></pre>
<h3 id="&#x968F;&#x673A;&#x6570;"><a name="&#x968F;&#x673A;&#x6570;" class="anchor-navigation-ex-anchor" href="#&#x968F;&#x673A;&#x6570;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x968F;&#x673A;&#x6570;</h3>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;dart:math&apos;</span>;  

<span class="hljs-keyword">void</span> main() {
  <span class="hljs-keyword">var</span> random = Random();
  <span class="hljs-built_in">print</span>(random.nextDouble()); <span class="hljs-comment">// &#x4ECB;&#x4E8E; 0.0 ~ 1.0&#xFF1A; [0, 1)</span>
  <span class="hljs-built_in">print</span>(random.nextInt(<span class="hljs-number">10</span>));  <span class="hljs-comment">// &#x4ECB;&#x4E8E; 0 ~ 9 &#xFF1A; [0, 9)</span>
  <span class="hljs-built_in">print</span>(random.nextBool());   <span class="hljs-comment">// &#x751F;&#x6210;&#x968F;&#x673A;&#x5E03;&#x5C14;&#x503C;</span>
}
</code></pre>
<p>&#x8FD8;&#x53EF;&#x7528;&#x4E8E;&#x5217;&#x8868;&#x7684;<code>shuffle</code>&#x65B9;&#x6CD5;&#x4E2D;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;dart:math&apos;</span>;

<span class="hljs-keyword">void</span> main() {
  <span class="hljs-keyword">var</span> names = [<span class="hljs-string">&quot;zhangsan&quot;</span>,<span class="hljs-string">&quot;lisi&quot;</span>,<span class="hljs-string">&quot;lee&quot;</span>,<span class="hljs-string">&quot;burce&quot;</span>];
  <span class="hljs-built_in">print</span>(names);
  <span class="hljs-comment">// &#x968F;&#x673A;&#x6253;&#x4E71;&#x5217;&#x8868;&#x987A;&#x5E8F;</span>
  names.shuffle(Random());
  <span class="hljs-built_in">print</span>(names);
}
</code></pre>
<h2 id="json-&#x7F16;&#x89E3;&#x7801;"><a name="json-&#x7F16;&#x89E3;&#x7801;" class="anchor-navigation-ex-anchor" href="#json-&#x7F16;&#x89E3;&#x7801;"><i class="fa fa-link" aria-hidden="true"></i></a>JSON &#x7F16;&#x89E3;&#x7801;</h2>
<p>Dart &#x63D0;&#x4F9B;&#x4E86;<code>dart:convert</code>&#x5E93;&#x76F4;&#x63A5;&#x7528;&#x4E8E;JSON&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">import</span> <span class="hljs-string">&apos;dart:convert&apos;</span>;

<span class="hljs-keyword">var</span> scores = [
  {<span class="hljs-string">&apos;score&apos;</span>: <span class="hljs-number">40</span>},
  {<span class="hljs-string">&apos;score&apos;</span>: <span class="hljs-number">80</span>},
  {<span class="hljs-string">&apos;score&apos;</span>: <span class="hljs-number">100</span>, <span class="hljs-string">&apos;overtime&apos;</span>: <span class="hljs-keyword">true</span>, <span class="hljs-string">&apos;special_guest&apos;</span>: <span class="hljs-keyword">null</span>}
];

<span class="hljs-keyword">void</span> main() {
    <span class="hljs-comment">// jsonEncode&#x51FD;&#x6570;&#x5C06;Dart&#x7684;List&#x6216;Map&#x5BF9;&#x8C61;&#x7F16;&#x7801;&#x4E3A;json&#x683C;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;</span>
    <span class="hljs-keyword">var</span> jsonText = jsonEncode(scores);
    <span class="hljs-keyword">assert</span>(jsonText ==
        <span class="hljs-string">&apos;[{&quot;score&quot;:40},{&quot;score&quot;:80},&apos;</span>
        <span class="hljs-string">&apos;{&quot;score&quot;:100,&quot;overtime&quot;:true,&apos;</span>
        <span class="hljs-string">&apos;&quot;special_guest&quot;:null}]&apos;</span>);

    <span class="hljs-comment">// jsonDecode &#x51FD;&#x6570;&#x5C06;json&#x683C;&#x5F0F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x89E3;&#x7801;&#x4E3A;Dart&#x7684;List&#x6216;Map&#x5BF9;&#x8C61;</span>
    <span class="hljs-keyword">var</span> scores = jsonDecode(jsonString);
    <span class="hljs-keyword">assert</span>(scores <span class="hljs-keyword">is</span> <span class="hljs-built_in">List</span>);
}
</code></pre>
<h3 id="&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;"><a name="&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;" class="anchor-navigation-ex-anchor" href="#&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;</h3>
<p><code>dart:convert</code>&#x8FD8;&#x53EF;&#x7528;&#x4E8E;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x7F16;&#x89E3;&#x7801;&#xFF0C;&#x5373;Java&#x4E2D;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x4E0E;&#x5B57;&#x8282;&#x6570;&#x7EC4;&#x7684;&#x76F8;&#x4E92;&#x8F6C;&#x6362;&#x3002;</p>
<pre><code class="lang-dart"><span class="hljs-keyword">void</span> main() {
  <span class="hljs-comment">// &#x7528;utf8&#x7F16;&#x7801;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x6362;&#x4E3A;&#x5B57;&#x8282;&#x6570;&#x7EC4;</span>
  <span class="hljs-built_in">List</span>&lt;<span class="hljs-built_in">int</span>&gt; utf8Bytes = utf8.encode(<span class="hljs-string">&apos;Dart&#x7F16;&#x7A0B;&#x6307;&#x5357;&apos;</span>);
  <span class="hljs-built_in">print</span>(utf8Bytes);

  <span class="hljs-comment">// &#x5C06;utf8&#x7F16;&#x7801;&#x7684;&#x5B57;&#x8282;&#x6570;&#x7EC4;&#x8F6C;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;</span>
  <span class="hljs-built_in">String</span> text = utf8.decode(utf8Bytes);
  <span class="hljs-built_in">print</span>(text);
&#xFF5D;
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;Dart&#x9ED8;&#x8BA4;&#x4F7F;&#x7528;<code>utf-8</code>&#x7F16;&#x7801;&#xFF0C;<code>dart:convert</code>&#x5E93;&#x53E6;&#x5916;&#x8FD8;&#x63D0;&#x4F9B;&#x4E86;ASCII&#x548C;ISO-8859-1 (Latin1)&#x8F6C;&#x6362;&#x5668;&#xFF0C;&#x5982;&#x9700;&#x5904;&#x7406;<code>GBK</code>&#x7F16;&#x7801;&#xFF0C;&#x9700;&#x8981;&#x4F7F;&#x7528;&#x7B2C;&#x4E09;&#x65B9;&#x5E93;&#x8FDB;&#x884C;&#x8F6C;&#x6362;&#x3002;</p>
<h2 id="dart-27-&#x65B0;&#x7279;&#x6027;"><a name="dart-27-&#x65B0;&#x7279;&#x6027;" class="anchor-navigation-ex-anchor" href="#dart-27-&#x65B0;&#x7279;&#x6027;"><i class="fa fa-link" aria-hidden="true"></i></a>Dart 2.7 &#x65B0;&#x7279;&#x6027;</h2>
<h3 id="&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;extension-methods&#xFF09;"><a name="&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;extension-methods&#xFF09;" class="anchor-navigation-ex-anchor" href="#&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;extension-methods&#xFF09;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#xFF08;Extension methods&#xFF09;</h3>
<p>Dart 2.7 &#x6DFB;&#x52A0;&#x4E86;&#x4E00;&#x4E2A;&#x5F3A;&#x5927;&#x7684;&#x65B0;&#x7279;&#x6027;&#xFF1A;&#x6269;&#x5C55;&#x65B9;&#x6CD5;&#x3002;&#x5B83;&#x4F7F;&#x4F60;&#x53EF;&#x4EE5;&#x5411;&#x4EFB;&#x4F55;&#x7C7B;&#x578B;&#x6DFB;&#x52A0;&#x65B0;&#x529F;&#x80FD;&#xFF0C;&#x5E76;&#x5177;&#x6709;&#x5E38;&#x89C4;&#x65B9;&#x6CD5;&#x8C03;&#x7528;&#x7684;&#x7B80;&#x6D01;&#x6027;&#x3002;&#x5F53;&#x6211;&#x4EEC;&#x5728;&#x4F7F;&#x7528;&#x67D0;&#x4E9B;SDK&#x4E2D;&#x7684;&#x7C7B;&#x65F6;&#xFF0C;&#x7531;&#x4E8E;&#x65E0;&#x6CD5;&#x4FEE;&#x6539;&#x7C7B;&#x7684;&#x6E90;&#x7801;&#xFF0C;&#x5BFC;&#x81F4;&#x6211;&#x4EEC;&#x4E0D;&#x80FD;&#x6269;&#x5C55;&#x8BE5;&#x7C7B;&#xFF0C;&#x8FD9;&#x4E2A;&#x7279;&#x6027;&#x5C31;&#x5F88;&#x597D;&#x7684;&#x89E3;&#x51B3;&#x4E86;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x3002;</p>
<pre><code class="lang-dart">extension &lt;extension name&gt; on &lt;type&gt; {
  (&lt;member definition&gt;)*
}
</code></pre>
<p>&#x4EE3;&#x7801;&#x793A;&#x4F8B;</p>
<pre><code class="lang-dart">extension SplitChar on <span class="hljs-built_in">String</span> {
    <span class="hljs-built_in">List</span>&lt;<span class="hljs-built_in">String</span>&gt; toList(){
    <span class="hljs-keyword">return</span> <span class="hljs-keyword">this</span>.split(<span class="hljs-string">&apos;&apos;</span>);
    }
}

<span class="hljs-keyword">void</span> main() {
  <span class="hljs-comment">// 1.&#x76F4;&#x63A5;&#x4F7F;&#x7528;: [a, b, c, d, e, f]</span>
  <span class="hljs-built_in">print</span>(<span class="hljs-string">&quot;abcdef&quot;</span>.toList());

  <span class="hljs-comment">// 2.&#x4F7F;&#x7528;&#x5305;&#x88C5;&#x7C7B;: [a, b, c, d, e, f]</span>
  <span class="hljs-built_in">print</span>(SplitChar(<span class="hljs-string">&quot;abcdef&quot;</span>).toList());
}
</code></pre>
<h3 id="&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;"><a name="&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;" class="anchor-navigation-ex-anchor" href="#&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;"><i class="fa fa-link" aria-hidden="true"></i></a>&#x5B89;&#x5168;&#x5B50;&#x5B57;&#x7B26;&#x4E32;</h3>
<p>&#x9700;&#x8981;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x7B2C;&#x4E09;&#x65B9;&#x5E93; <a href="https://pub.dev/packages/characters#-readme-tab-" target="_blank">characters </a></p>
<pre><code class="lang-dart"><span class="hljs-keyword">var</span> input = [<span class="hljs-string">&apos;Resume&apos;</span>, <span class="hljs-string">&apos;Re&#x301;sume&#x301;&apos;</span>, <span class="hljs-string">&apos;&#xC774;&#xB825;&#xC11C;&apos;</span>, <span class="hljs-string">&apos;&#x1F4BC;&#x1F4C3;&apos;</span>, <span class="hljs-string">&apos;Curr&#xED;culo&apos;</span>];
input.forEach((s) =&gt; <span class="hljs-built_in">print</span>(s.substring(<span class="hljs-number">0</span>, <span class="hljs-number">3</span>)));
input.forEach((s) =&gt; <span class="hljs-built_in">print</span>(s.characters.take(<span class="hljs-number">3</span>)));
</code></pre>
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